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. 1982 May;21(5):811–818. doi: 10.1128/aac.21.5.811

Erythromycin, carbomycin, and spiramycin inhibit protein synthesis by stimulating the dissociation of peptidyl-tRNA from ribosomes.

J R Menninger, D P Otto
PMCID: PMC182017  PMID: 6179465

Abstract

In mutant Escherichia coli with temperature-sensitive peptidyl-tRNA hydrolase (aminoacyl-tRNA hydrolase; EC 3.1.1.29), peptidyl-tRNA accumulates at the nonpermissive temperature (40 degrees C), and the cells die. These consequences of high temperature were enhanced if the cells were first treated with erythromycin, carbomycin, or spiramycin at doses sufficient to inhibit protein synthesis in wild-type cells but not sufficient to kill either mutant or wild-type cells at the permissive temperature (30 degrees C). Since peptidyl-tRNA hydrolase in he mutant cells is inactivated rapidly and irreversibly at 40 degrees C, the enhanced accumulation of peptidyl-tRNA and killing were the result of enhanced dissociation, stimulated by the antibiotics, of peptidyl-tRNA from ribosomes. The implications of these findings for inhibition of cell growth and protein synthesis are discussed. Certain alternative interpretations are shown to be inconsistent with the relevant data. Previous conflicting observations on the effects of macrolide antibiotics are explained in terms of our observations. We conclude that erythromycin, carbomycin, and spiramycin (and probably all macrolides) have as a primary mechanism of action the stimulation of dissociation of peptidyl-tRNA from ribosomes, probably during translocation.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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